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b-DAZL:A novel gene in bovine spermatogenesis

Progress in Natural Science:Materials International 2008年第10期18卷 1209-1218页

作者： Qingbo Zhang~a Qifa Li~(a,*) Jiahuang Li~b Xinfu Li~a Zhenshan Liu~a Dawei Song~a Zhuang Xie~a ~a Laboratory of Animal Reproductive Genetics and Molecular Evolution,college of Animal Science and Technology,nanjing Agriculture university,nanjing 210095,china ~b Pharmaceutic Biotechnology Key Laboratory,college of Life Science,nanjing university,nanjing 210093,china Laboratory of Animal Reproductive Genetics and Molecular Evolution College of Animal Science and Technology Nanjing Agriculture University Nanjing 210095 China Pharmaceutic Biotechnology Key Laboratory College of Life Science Nanjing University Nanjing 210093 China

The DAZL gene plays an important role in *** and mutation of this gene has been frequently associated with the sterility in both vertebrates and ***,a cDNA containing the complete open reading frame of DAZL gene,which encodes putative RRM RNA-binding protein,was isolated from bovine tissues by *** isolated gene was referred to as ***-based location analysis showed that b-DAZL is located near the end of chromosome *** b-DAZL gene and its vertebrate homologue shared a high nucleotide similarity (90-94%) in the coding region and in the genomic organization,each consisting of 10 exons and 9 *** protein products contained a highly conserved RNA-binding motif,a unique DAZ repeat, and PUM2 and PABP interacting ***-PCR assay revealed that b-DAZL was expressed in the testis and ***,no signals were detected in the testes of sterile male *** microstructure of the testes of sterile males showed very few spermat- ocytes but mostly somatic *** observations are consistent with the typical phenotype of testes with defective DAZL expression. Subsequent gene detection studies indicated that transcription arrest might lead to a b-DAZL transcript defect in testes of cattle-yaks. Our results suggest that b-DAZL may be involved in spermatogenesis,and that transcription arrest of the gene is associated with male sterility in cattle-yaks.

关键词： Cattle-yak b-DAZL Male sterility Sequence analysis Expression profile

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A three level linearized compact difference scheme for the Cahn-Hilliard equation

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Science china Mathematics 2012年第4期55卷 805-826页

作者： LI Juan 1,2 ,SUN ZhiZhong 1,& ZHAO Xuan 1 1 Department of Mathematics,Southeast university,nanjing 210096,china 2 Yingtian college,nanjing 210046,china 1. Department of Mathematics Southeast University Nanjing 210096 China2. Yingtian College Nanjing 210046 China

This article is devoted to the study of high order accuracy difference methods tor the Cahn-rnmara equation. A three level linearized compact difference scheme is derived. The u^ique solvability and uaconditional convergence of the difference solution are proved. The convergence order is O（T2＋h4） in the maximum norm. The mass conservation and the non-increase of the total energy are also verified. Some numerical examples are given to demonstrate the theoretical results.

关键词： Cahn-Hilliard equation compact difference scheme convergence solvability conservation energynon-increase

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Experimental Study of RC Beams Strengthened with CFRP Sheets Under Sustaining Loads

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Journal of Wuhan university of Technology(Materials Science) 2006年第3期21卷 82-85页

作者：王文炜 Transportation college Southeast UniversityNanjing 210096China

Seven reinforced concrete （ RC ） beams strengthened in flexure using carbon fiber reinforced polymer （CFRP） sheets subjected to different sustaining loads were tested. The effects of initial load and load history on the ultimate strength of strengthened RC beams were examined by externally bonded CFRP sheets. The main experimental parameters included different levels of sustaining load at the time of strengthening, and load history. Experimental results show that sustaining load levels at the time of strengthening have important influences on the ultimate strength of strengthened RC beams. If the initial load is the same, the ultimate strength of RC beams strengthened with CFRP sheets is almost the same regardless of load history at the time of strengthening.

关键词： CFRP RC beams sustaining load experimental study

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Study on design pressure of in-service welding pipes

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Science china(Technological Sciences) 2006年第4期49卷 434-444页

作者： XUE Xiaolong1, ZHU Jiagui2 & SANG Zhifu1 1. college of Mechanical and Power Engineering, nanjing university of Technology, nanjing 210009, china 2. nanjing Yangzi Petrochemical Maintenance and Installation Co. Ltd., nanjing 210048, china 1. college of Mechanical and Power Engineering Nanjing University of Technology Nanjing 210009 China 2. nanjing Yangzi Petrochemical Maintenance and Installation Co. Ltd. Nanjing 210048 China

A method of predicting design pressure and burn-through of in-service welding pipes was established. Temperature distributions of in-service welding under variable parameters were simulated by FEM. The effect of flowing of internal media was regarded as forced convection. Based on the numerical results, design pressure of the pipe can be obtained and burn-through can be predicted. It can be concluded that the design pressure decreases with the increasing of heat input. RSF and design pressure of the pipe increase with the increasing of flow rate. There is a range in which the increase changes greatly. For in-service welding, the range should be considered adequately to determine operating condition optimally. RSF increases with the increasing of pipe wall thickness. While the thickness increases to an extent, RSF shows little increase. Accord- ing to the curves of design pressure versus different parameters, safe working pressure can be achieved.

关键词： in-service welding, heat input, flow rate, pipe wall thickness, design pressure.

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Secure coverage-preserving node scheduling scheme using energy prediction for wireless sensor networks

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The Journal of china Universities of Posts and Telecommunications 2010年第5期17卷 100-108页

作者： LI Zhi-yuan,WANG Ru-chuan. college of Computer,nanjing university of Posts and Telecommunications,nanjing 210003,china [a] college of Computer Nanjing University of Posts Telecommunications Nanjing 210003 China

With the fast development of the micro-electro-mechanical systems （MEMS）,wireless sensor networks （WSNs） have been extensively *** of the studies focus on saving energy consumption because of restricted energy supply in ***-based node scheduling scheme is commonly considered as one of the most energy-efficient ***,it is not always so efficient especially when there exist hot spot and network attacks in *** this article,a secure coverage-preserved node scheduling scheme for WSNs based on energy prediction is proposed in an uneven deployment *** scheme is comprised of an uneven clustering algorithm based on arithmetic progression,a cover set partition algorithm based on trust and a node scheduling algorithm based on energy *** results show that network lifetime of the scheme is 350 rounds longer than that of other scheduling ***,the scheme can keep a high network coverage ratio during the network lifetime and achieve the designed objective which makes energy dissipation of most nodes in WSNs balanced.

关键词： wireless sensor networks secure energy-efficient coverage node scheduling cover set energy prediction

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MODELING OF WATER DYNAMICS AND POLLUTANT SPREADING IN THE LUOMAHU RESERVOIR FOR WATER TRANSFER FORM SOUTH TO NORTH OF china

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Journal of Hydrodynamics 2001年第4期13卷 14-23页

作者： Wang Chao college of Water Resources and Environment, Hohai university, nanjing 210098, china college of Water Resources and Environment Hohai University

Water quality is the key problem of the East-Line Project of Water Transfer from South to North china. In this paper, the principles of a 1D and 2D-integrated mathematical model for describing the dynamics of water in a flow-through river, canals and lakes was worked out. The numerical method and model algorithm were developed. The efficiency of the model was estimated by applying it to studying water dynamics in the Luomahu reservoir and simulating the spreading process of a polluted water mass and the evolution of the concentration. The results of calculations are used to assess water environmental quality and to manage water resource in the Luomahu reservoir and the Jinghang-Canal for the Project of Water Transfer from South to North china.

关键词： mathematical model integral stream function water quality Water Transfer from South to North Project

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Modal identification based on Hilbert-Huang Transform of structural response with S VD preprocessing

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Acta Mechanica Sinica 2009年第6期25卷 883-888页

作者： Min Zheng Fan Shen Yuping Dou Xiaoyan Yan college of Civil Aviation,nanjing university of Aeronautics and Astronautics,210016 nanjing. china college of Civil Aviation Nanjing University of Aeronautics and Astronautics 210016 Nanjing China

In recent years, Empirical mode decomposition and Hilbert spectral analysis have been combined to identify system parameters. Singular-Value Decomposition is pro- posed as a signal preprocessing technique of Hilbert-Huang Transform to extract modal parameters for closely spaced modes and low-energy components. The proposed method is applied to a simulated airplane model built in Automatic Dynamic Analysis of Mechanical Systems software. The results demonstrate that the identified modal parameters are in good agreement with the baseline model.

关键词： Modal identification . Hilbert-Huang Transforms - Singular-value decomposition . Signal processing

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Morphology and reaction force of toes of geckos freely moving on ceilings and walls

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Science china(Technological Sciences) 2010年第6期53卷 1688-1693页

作者： WANG ZhouYi1,2,GU WenHua1,2,WU Qiang1,2,JI AiHong1 & DAI ZhenDong1 1 Institute of Bio-inspired Structure and Surface Engineering,nanjing university of Aeronautics and Astronautics,nanjing 210016,china 2 college of Mechanical and Electrical Engineering,nanjing university of Aeronautics and Astronautics,nanjing 210016,china 1. Institute of Bio-inspired Structure and Surface Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 China2. College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 China

The 3-dimensional interactions between toes of a gecko and substrates (ceilings or walls) were measured when it moves on ceilings or walls by using a 3-dimensional force measuring array,and the correspondent morphology of the gecko toes was recorded by a high speed *** study aims to understand the relationship between adhesive and shear forces generated by the toes of the gecko and the locomotion behavior when it walks on walls and *** showed that shear force is along the toe-only 12.6° and 3.1° away from the toe for wall-climbing and ceiling-crawling,respectively while the adhesion is big enough to balance the body weight and *** shear forces generated by the first and the fifth toes are in opposite directions;this redundant force increases the reliability of adhesion and stability of *** support angles of toes are equal approximately for ceiling-crawling and *** study greatly inspires the design of a gecko-like robot.

关键词： reaction force of toe morphometrics ceiling redundant force gecko-like robot

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Molecular group dynamics study on slip flow of thin fluid film based on the Hamaker hypotheses

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Science china(Technological Sciences) 2010年第7期53卷 1833-1838页

作者： ZHOU JianFeng, SHAO ChunLei & GU BoQin college of Mechanical and Power Engineering, nanjing university of Technology, nanjing 210009, china 1. college of Mechanical and Power Engineering Nanjing University of Technology Nanjing 210009 China

The thin fluid film was assumed to consist of a number of spherical fluid molecular groups and the attractive forces of molecular group pairs were calculated by the derived equation according to the three Hamaker homogeneous material hypotheses. Regarding each molecular group as a dynamics individual, the simulation method for the shearing motion of multilayer fluid molecular groups, which was initiated by two moving walls, was proposed based on the Verlet velocity iterative algorithm. The simulations reveal that the velocities of fluid molecular groups change about their respective mean velocities within a narrow range in steady state. It is also found that the velocity slips occur at the wall boundary and in a certain number of fluid film layers close to the wall. Because the dimension of molecular group and the number of group layers are not restricted, the hypothetical thickness of fluid film model can be enlarged from nanometer to micron by using the proposed simulation method.

关键词： Hamaker hypotheses molecular group velocity slip Lennard-Jones potential

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A new smoothing scheme for mathematical programs with complementarity constraints

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Science china Mathematics 2010年第7期53卷 1881-1890页

作者： YAN TaoDepartment of Information and Computational Sciences, college of Science, nanjing university of Science and Technology, nanjing 210094, china 1. Department of Information and Computational Sciences College of Science Nanjing University of Science and Technology Nanjing 210094 China

In this paper, we consider a mathematical program with complementarity constraints (MPCC). We present a new smoothing scheme for this problem, which makes the primal structure of the complementarity part unchanged mostly. For the new smoothing problem, we show that the linear independence constraint qualification (LICQ) holds under some conditions. We also analyze the convergence behavior of the smoothing problem, and get some sufficient conditions such that an accumulation point of stationary points of the smoothing problems is C (M, B)-stationarity respectively. Based on the smoothing problem, we establish an algorithm to solve the primal MPCC problem. Some numerical experiments are given in the paper.

关键词： mathematical program with complementarity constrains MPEC-LICQ B-stationarity C-stationarity M-stationarity

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